Form for molding a tapered bore in concrete

ABSTRACT

A form including a tapered body of cylindrical cross section for mounting between the inner and outer sections of a mold and with its ends in abutting engagement with adjacent corners of both mold sections, and around which concrete is poured between the mold sections to produce a bore in the concrete, when set, which extends through the corner of the concrete and which tapers from the exterior to the interior thereof. A hanger of the form is detachably secured to the outer mold section to support the body between the mold sections while the concrete is poured and allowed to set. The body is composed of tapered staves certain of which may be detached to permit contraction of the body for removal thereof from the set concrete. The ends of the body are shaped to abut flush against portions of walls forming right angular corners of the inner and outer mold sections.

United States Patent 1191 Lengel 1 1 Sept. 11, 1973 FORM FOR MOLDING A TAPERED BORE IN Primary Exar'ninerJ. Spencer Overholser CONCRETE Assistant Examiner-B. D. Tobor [76] inventor: George W. Lengel, R.F.D. No. l, Attorney-John Randolph Pine Grove, Pa. 17963 1 22 Filed: Nov. 18, 1971 [571 ABSTRACT [21] Appl NOJ 200,037 A form including a tapered body of cylindrical cross section for mounting between the inner and outer sec- 7 tions of a mold and with its ends in abutting engage- 521 US. c1.... 249 177, 249/178, 249/186 ihehi wiih adjacent iiih hiid seciiiihs' and 51 1111. C1. E04g 15/04, B28b 7/30 i which is Piiiieii beiweeii "iiiiii [58] Field of Search 249/175, 177, 178, Secimhs Produce a hm ihe when 249/180, 184 186 l which extends through the corner of the concrete and which tapers from the exterior to the interior thereof. A hanger of the form is detachably secured to the outer [56] References Cited mold section to support the body between the mold UNITEDSTATE PATENTS sections while the concrete is poured and allowed to 1,245,618 11 1917 Quisurnbingmi .I 249/1 x The him) is iiipeied Siaves.eiiai" of 1,120,539 12 1914 Rigby 249/184 x which may be detached Permit chiiachh the 744970 11/1903 I 249,175 X body for removal thereof from the set concrete. The 1,000,427 8/1911 Miller 249/178 x ends of the y are Shaped toabut flush against P 1,319,929 10/1919 Miller 249/186 tions of walls forming right angular corners of the inner 721,837 3/1903 Ross 249/178 and outermold sections.

5 Claims, 9 Drawing; Figures PATENIED 3.758.068

saw 1 0F 2 FIG. I

INVENTOR GEORGE W. LENGEL BY 74, Z v

ATTORNEY PATENTEDBEPI Hm IN VENTOR GEORGE W. LENGEL SHEET 2 0F 2 wmk mv/ FORM FOR MOLDING A TAPERED BOREIN CONCRETE SUMMARY It is a primary object of the presentinvention to provide a form for use in molding a bore in a corner of a concrete inlet box of a highway drainage system, for example, to which a soil pipe leading to the;inlet box can be readily connected.

Another object of the invention is to provide azform including a hanger for suspending a tapered bodybetween outer and inner sections of a moldwhile concrete is, poured and allowed to set around the form.

A further object of the invention is to provide a form including abody which is capable of beingcontracted for readyremoval from the set concrete.

Another object of the invention is to provide a form which is tapered for molding aborewhich'tapers from its outer to its inner end to facilitate engagement of the discharged endof a soil pipe therein.

Still another object of the invention is to provide a form having tapered ends shaped to abut flush against the corners of mold sections between which theiform is disposed. f

A further object of the invention is to provide a form including a tapered body having means for connecting and drawing the staves thereof toward one another; and which includes certain staves capable of being detached. from said means and from the body. to effect contraction of the body.

Various other objects and advantages of the invention will hereinafter become more fully apparent, from the following description of thedrawings, illustrating a presently preferred embodiment thereof, and wherein:

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing the body and hanger of the form assembled;

FIG. 2 is an end elevational view thereof, taken in a direction as indicated by the line 2-2 of FIG. 1;

FIG. 3 is a similar view, taken inthe direction as indicated by the line 3-3 of FIG. 1;

FIG. 4 is a side elevational view of one of the staves of the body;

FIG. 5 is a similar view of another stave;

FIG. 6 is an enlarged side elevational view of the hanger;

FIG. 7 is an end elevational view thereof, looking in the direction as indicated by the line 7-7 of FIG. 6;

FIG. 8 is a fragmentary'plan view showing the form, applied to a mold, and

FIG. 9 is a fragmentary plan view, on a reduced scale showing a part of a highway drainage system including a concrete inlet box, in connection with the fabrication of which the form, is utilized.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring more specifically to the drawings, the form for molding a bore in the corner of a concreteinlet box is designated generally 10 and comprises a contractile tapered hollow body, designated generally ,11, and a hanger, designated generally 12.

The tapered hollow body 11 is composed of a plurality of pairs of staves, 13, 14, 15, 16, 17, 18.and 19. The staves 13 constitute the top and bottom staves of the body 11. The staves 14, 15, 16, 17, 18 and 19 are disposed on the opposite sides of the body consecutively from top to bottom so that the top stave 13 is disposed between the two staves 14 and the bottom stave 13 is disposed between the two staves 19. The staves 13 at the large end 23 of the body are beveled to provide outwardly converging faces 20 and the staves 14, 15, 16, l7, l8 and 19, on opposite sides of the vertical center of the body 11 have their ends beveled at said enlarged end 23,.as seen at 21, to lie in the same planes as the surfaces 20 of the two staves 13, on either side of the vertical center of the body 11. The coplanar surfaces 20 and 21 define corresponding outwardly converging end faces 22 at the larger end 23 0f the body 11 and which, in the embodiment illustrated, form a right angle with one another.

At the smaller end 24 of the body 11, as seen in FIG. 3, the staves 13 are cut to provide V-shaped notches having inwardly converging faces 25 which are disposed at right angles to, one'another. The staves 14, 15, 16,. 17, 18and 19, at the smaller end 24, are beveled as seen at 26, so that the beveled ends 26 on either side of the verticalcenter of thebody 11 are disposed in the same plane as the surface 25 of the same vertical half to provide two corresponding inwardly converging sides 27, at the smaller end 24, which form a right angle in the embodiment illustrated. All of the staves 13 taper from the end 23 to the end 24 of the body 11, and have side walls 28 which taper from the outer to the inner faces of. the staves, so that the side, walls can normally assume abutting engagement with one another, as illustrated in FIGS. 1, 2 and 3. The exterior surfaces 29 of the staves 13-19 are preferably rounded transversely, so that the body 1 1 is substantially circular in cross section.

All of the staves 13-16, 18 and. 19 have two transverse bores 30 opening through the sides 28 thereof and which bores are disposed in alignment when the staves are assembled to form the body 11, as illustrated in FIGS. 1 to 3. The staves. 17 have slots 31 opening transversely through the two sides 28 thereof and which extend from adjacent the ends 21 through the ends 26, as illustrated in FIG. 4. The openings 30 of the staves 16 and 18 register with the slots 31 when the body 11 is assembled. Two contractile coil springs 32, portions of one of which is shown in FIG. 3, extend through the aligned bores 30 and. across the slots 31 and are connected together at their ends in any conventional manner, not shown, to provide endless elastic means. Said springs 32 are disposed under tension for yieldably holding the stave sides 28 in abutting engagement as illustrated in the drawings.

The hanger 12 includes three discs 33, 34 and 35 which are connected by a bar .36. The disc 33 is mounted at one end of the bar 36 and the disc 35 is located at the opposite end of said bar. The disc 34 is dis posed adjacent the disc 35 and is of slightly larger diameter than said disc 35 but of substantially smaller diameter than the disc 33. The discs 33, 34 and 35 have peripheries 37 which are beveled transversely in the same direction and at the same angle to conformably engage longitudinally spaced portions of the bore 38 of the body 11. A bar 39 is fixed to and projects from the enlarged outer face of the disc 33. Said bar is of substantial width and disposed in a vertical plane and has and upper edge 40 which is inclined upwardly and outwardly from the disc 33 and which is of inverted V- shape in cross section, as defined by the beveled sides 41 which converge with one another to form a ridge 42. The outer end of the bar 39 is beveled on its opposite sides to provide faces 43 which are disposed at approximately a right angle to one another. The bottom edge 44 of the bar 39 is disposed substantially parallel to the axis of the bar 36 and may be beveled in the same manner as the upper edge 40. Said upper edge 40, near its outer end, is provided with a recess 45. Two bores 46 are formed in the bar 39 each having an end opening into the recess 45 and an opposite end opening through one of the faces 43, for a purpose which will hereinafter be described.

FIG. 8 discloses a portion of a mold 47 for producing a concrete inlet box 48, constituting a part of a highway drainage system, as illustrated in FIG. 9, and as more fully shown and described in my co-pending US. Pat. application entitled Form For Molding a Bore in Concrete, filed Oct. 28, 1971, and bearing Ser. No. 193,271. The mold 47 includes an inner mold section 50 surrounded by an outer mold section 51. The mold section 50 includes right angularly disposed walls 52 forming a corner 53. The mold section 51 includes right angularly disposed walls 54 forming a corner 55. The form is shown in the space 56 of the mold 47 between the corners 53 and 55.

After the outer mold section 51 has been erected, the end faces 43 of the hanger 12 are positioned in a part of the corner 55 abutting portions of the inner sides of the walls 54 and driven fastening, such as nails, not shown, are driven through the openings 46 and into the walls 54, sufficiently to support the weight of the hanger l2 and the body 11. The enlarged end of the bore 38 is then inserted over the hanger 12 from its restricted end 35 and advanced toward the comer 55 until the end faces 22 are in abutting engagement with portions of the inner sides of the walls 54 for positioning the body 11, as shown in FIG. 8, relative to the outer mold section 51. With the parts thus disposed, the peripheries 37 of the discs 33, 34, and 35 conformably engage snugly against longitudinally spaced portions of the body 11 defining the bore 38. The hanger 12 is of a length less than the body 11 so that the disc 35 is spaced inwardly from the body end 24. Inner mold section 50 is then erected centrally within the outer mold section 51 and with a part of the corner 53 thereof engaging the restricted end 24 of the body 11 and parts of the walls 52 in abutting engagement with the end surfaces 27 of said end 24.

Concrete, not shown, is then poured in the space 56 around the body 11. After the concrete has set, the outer mold section 51 is removed. In accomplishing this, the nails, not shown, which support the hanger 12, move with the walls 54 as said walls are drawn outwardly thereby pulling the hanger 12 from the body 11 through the larger end 23. The two staves 17 can then be extracted or pulled outwardly from the enlarged end 23 and completely detached from the body 11, to allow the springs 32 to contract said body 11 by drawing the staves 16 and 18 toward one another and into the spaces previously occupied by said staves 17, so that the body 11 can be removed outwardly from the comer 57 of the concrete inlet box 48, leaving an inwardly tapered bore, not shown, extending from the exterior to the interior of the box 48, into which can be inserted the discharge end 58 of a soil pipe 59. The end 58 can be advanced into the bore until a tight fit is accomplished.

hanger 12 is preferably formed of wood, and the staves, forming the body 11, are preferably formed of a light weight metal, such as aluminum, which will not expand or contract due to mositure.

The body 11 could be wedged between the corners 53 and 55 of the form 47, in which case the hanger 12 could be omitted.

Various other modifications and changes are contemplated and may be resorted to, without departing from the function or scope of the invention.

I claim as my invention:

1. A form for molding a tapered bore in concrete comprising an elongated longitudinally tapered body hollow from end to end, of substantially circular cross section, composed of staves and having a large end shaped to abut flush against an interior portion of an outer mold section and a restricted end shaped to abut flush against a portion of the exterior of an inner mold section, while concrete is poured between the mold sections and allowed to set around said body to form an inwardly tapered bore through the set concrete, means for contracting said body after the outer mold section has been removed from the set concrete to effect detachment of the body from the concrete, means rendering certain of said staves slidably detachable endwise from the larger end of said body and constituting a part of said means to effect contraction of the body, said detachable stabes having slots opening through ends thereof constituting parts of the restricted end of the body, the remaining staves having aligned bores, and endless elastic means extending through said aligned bores and through parts of said slots and constituting another part of said means for contracting the body.

2. A form as in claim I, said body having angularly disposed faces at the larger end thereof for abutting engagement flush against inner sides of two walls forming a corner of the outer mold section and angularly disposed faces at the restrictive end of said body conformably engaging flush against portions of the outer sides of two walls forming a corner of the inner mold section, for forming the inwardly tapered bore in a comer of the concrete.

3. A form for molding a tapered bore in concrete comprising an elongated longitudinally tapered body hollow from end to end, of substantially circular cross section, composed of staves and having a large end shaped to abut flush against an interior portion of an outer mold section and a restricted end shaped to abut flush against a portion of the exterior of an inner mold section, while concrete is poured between the mold sections and allowed to set around said body to form an inwardly tapered bore through the set concrete, means for contracting said body after the outer mold section has been removed from the set concrete to effect detachment of the body from the concrete, said body having angularly disposed faces at the larger end thereof for abutting engagement flush against inner sides of two walls forming a comer of the outer mold section and angularly disposed faces at the restrictive end of said body conformably engaging flush against portions of the outer sides of two walls forming a corner of the inner mold section, for forming the inwardly tapered bore in a corner of the concrete, an elongated hanger having an enlarged end provided with angularly disposed faces adapted to conformably engage portions of the inner sides of said walls of the outer mold section and detachably secured thereto and disposed within ing transversely inclined peripheries for conformably contacting the interior of the body.

5. A form as in claim 1, and a hanger detachably secured to the outer mold section and projecting from the inner side thereof and on which said body is supported between the mold sections. 

1. A form for molding a tapered bore in concrete comprising an elongated longitudinally tapered body hollow from end to end, of substantially circular cross section, composed of staves and having a large end shaped to abut flush against an interior portion of an outer mold section and a restricted end shaped to abut flush against a portion of the exterior of an inner mold section, while concrete is poured between the mold sections and allowed to set around said body to form an inwardly tapered bore through the set concrete, means for contracting said body after the outer mold section has been removed from the set concrete to effect detachment of the body from the concrete, means rendering certain of said staves slidably detachable endwise from the larger end of said body and constituting a part of said means to effect contraction of the body, said detachable stabes having slots opening through ends thereof constituting parts of the restricted end of the body, the remaining staves having aligned bores, and endless elastic means extending through said aligned bores and through parts of said slots and constituting another part of said means for contracting the body.
 2. A form as in claim 1, said body having angularly disposed faces at the larger end thereof for abutting engagement flush against inner sides of two walls forming a corner of the outer mold section and angularly disposed faces at the restrictive end of said body conformably engaging flush against portions of the outer sides of two walls forming a corner of the inner mold section, for forming the inwardly tapered bore in a corner of the concrete.
 3. A form for molding a tapered bore in concrete comprising an elongated longitudinally tapered body hollow from end to end, of substantially circular cross section, composed of staves and having a large end shaped to abut flush against an interior portion of an outer mold section and a restricted end shaped to abut flush against a portion of the exterior of an inner mold section, while concrete is poured between the mold sections and allowed to set around said body to form an inwardly tapered bore through the set concrete, means for contracting said body after the outer mold section has been removed from the set concrete to effect detachment of the body from the concrete, said body having angularly disposed faces at the larger end thereof for abutting engagement flush against inner sides of two walls forming a corner of the outer mold section and angularly disposed faces at the restrictive end of said body conformably engaging flush against portions of the outer sides of two walls forming a corner of the inner mold section, for forming the inwardly tapered bore in a corner of the concrete, an elongated hanger having an enlarged end provided with angularly disposed faces adapted to conformably engage portions of the inner sides of said walls of the outer mold section and detachably secured thereto and disposed within said enlarged end of the body, and said hanger having longitudinally spaced members conformably engaging against the tapered interior surface of said body defining the hollow interior thereof for supporting the body on said hanger.
 4. A form as in claim 3, said longitudinally spaced members comprising discs of different diameters having transversely inclined peripheries for conformably contacting the interior of the body.
 5. A form as in claim 1, and a hanger detachably secured to the outer mold section and projecting from the inner side thereof and on which said body is supported between the mold sections. 